/// <summary>
/// Lerp between two transformation states.
/// </summary>
/// <param name="key1">Transformations from.</param>
/// <param name="key2">Transformations to.</param>
/// <param name="amount">How much to lerp.</param>
/// <param name="result">Out transformations.</param>
public static void Lerp(ref SpriteTransformation key1, ref SpriteTransformation key2, float amount,
ref SpriteTransformation result)
{
result.Position = Vector2.Lerp(key1.Position, key2.Position, amount);
result.Scale = Vector2.Lerp(key1.Scale, key2.Scale, amount);
result.Rotation = MathHelper.Lerp(key1.Rotation, key2.Rotation, amount);
}
/// <summary>
/// Clone the transformations.
/// </summary>
/// <returns>Cloned transformations.</returns>
public SpriteTransformation Clone()
{
var ret = new SpriteTransformation();
ret.Color = Color;
ret.Rotation = Rotation;
ret.Scale = Scale;
ret.Position = Position;
return(ret);
}
/// <summary>
/// Merge two transformations into one.
/// </summary>
/// <param name="a">First transformation.</param>
/// <param name="b">Second transformation.</param>
/// <returns>Merged transformation.</returns>
public static SpriteTransformation Compose(SpriteTransformation a, SpriteTransformation b)
{
var result = new SpriteTransformation();
var transformedPosition = a.TransformVector(b.Position);
result.Position = transformedPosition;
result.Rotation = a.Rotation + b.Rotation;
result.Scale = a.Scale * b.Scale;
result.Color = MultiplyColors(a.Color, b.Color);
return(result);
}
/// <summary>
/// Clone an existing renderable object.
/// </summary>
/// <param name="copyFrom">Object to copy properties from.</param>
/// <param name="includeChildren">If true, will also clone children.</param>
public Renderable(Renderable copyFrom, bool includeChildren)
{
// copy basics
Visible = copyFrom.Visible;
Zindex = copyFrom.Zindex;
_localTrans = copyFrom._localTrans.Clone();
// clone children
if (includeChildren)
{
foreach (var child in copyFrom._children)
{
AddChild(child.Clone(true));
}
}
// update transformations
UpdateTransformations();
}
/// <summary>
/// Create the new renderable entity with default values.
/// </summary>
protected Renderable()
{
_children = new List <Renderable>();
_localTrans = new SpriteTransformation();
_worldTrans = new SpriteTransformation();
}
